SAT Question 236fee8e: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Function Of Specific Sentence
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Archeological excavation of Market Street Chinatown, a nineteenth-century Chinese American community in San Jose, California, provided the first evidence that Asian food products were imported to the United States in the 1800s: bones from a freshwater fish species native to Southeast Asia. Jinshanzhuang—Hong Kong–based import/export firms—likely coordinated the fish’s transport from Chinese-operated fisheries in Vietnam and Malaysia to North American markets. This route reveals the (often overlooked) multinational dimensions of the trade networks linking Chinese diaspora communities.
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Difficulty:Medium
Which choice best describes the function of the underlined sentence in the text as a whole?